/
route.go
119 lines (93 loc) · 2.02 KB
/
route.go
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package system
import (
"fmt"
"github.com/nats-io/nats.go"
"go.uber.org/zap"
)
type ContentType int32
const (
ContentType_Bytes ContentType = iota
ContentType_JSON
)
type RPCContext struct {
Req RPCRequest
Res RPCResponse
}
type RPCRequest struct {
Header map[string]interface{}
Data []byte
}
type RPCResponse struct {
ContentType ContentType
Header nats.Header
Data interface{}
Error error
}
type RPCHandler func(*RPCContext)
type Route struct {
prefix string
rpc *RPC
middlewares []RPCHandler
}
func NewRoute(rpc *RPC, prefix string, middlewares ...RPCHandler) *Route {
return &Route{
rpc: rpc,
prefix: prefix,
middlewares: middlewares,
}
}
func (r *Route) Use(handlers ...RPCHandler) {
r.middlewares = append(r.middlewares, handlers...)
}
func (r *Route) Handle(apiPath string, handlers ...RPCHandler) {
uri := fmt.Sprintf("%s.%s", r.prefix, apiPath)
logger.Info("Registered API",
zap.String("path", uri),
)
conn := r.rpc.connection
conn.QueueSubscribe(uri, "system", func(m *nats.Msg) {
logger.Info("-> " + uri)
ctx := &RPCContext{}
ctx.Req.Header = make(map[string]interface{})
ctx.Req.Data = m.Data
ctx.Res.ContentType = ContentType_JSON
for k, v := range m.Header {
ctx.Req.Header[k] = v
}
defer func() {
var data []byte
if ctx.Res.Data != nil {
if ctx.Res.ContentType == ContentType_JSON {
buf, _ := json.Marshal(ctx.Res.Data)
data = buf
}
}
// Response
reply := nats.NewMsg(m.Reply)
reply.Header = ctx.Res.Header
reply.Data = data
//err := m.Respond(data)
err := m.RespondMsg(reply)
if err != nil {
logger.Error(err.Error())
return
}
}()
// Default middleware
for _, middleware := range r.middlewares {
middleware(ctx)
if ctx.Res.Error != nil {
logger.Error(ctx.Res.Error.Error())
return
}
}
// Customized handlers
for _, h := range handlers {
h(ctx)
if ctx.Res.Error != nil {
logger.Error(ctx.Res.Error.Error())
return
}
}
})
}